| Medical Devices in Healthcare Ltd | Manufacturing | 2016 |
| Megz Limited | Real estate | 2002 |
| Melbourne Metals Holdings Limited | Financial services | 2024 |
| Meller Consult Ltd | Professional & scientific | 2016 |
| Meller Employment Ltd | Professional & scientific | 2016 |
| Meller Limited | Professional & scientific | 2016 |
| Meller Services Holdings Ltd | Financial services | 2016 |
| Memon Limited | Construction | 1987 |
| Merebrook Limited | Hospitality | 1968 |
| Merle Short Lets Limited | Hospitality | 2020 |
| Merrigan Limited | Professional & scientific | 2000 |
| Merton Priory Press Limited | Information & communication | 1993 |
| Metmachex Engineering Limited | Manufacturing | 2002 |
| MF Tech Room Ltd | Other services | 2026 |
| MG & MG Cafe Ltd | Hospitality | 2025 |
| MG Simister & SON Limited | Wholesale & retail | 2006 |
| MGB Quantity Surveyors Limited | Professional & scientific | 2000 |
| MHF Realisations Limited | Water & waste | 1984 |
| MHS Design Services Limited | Professional & scientific | 1999 |
| Michael I Holdsworth Limited | Wholesale & retail | 1986 |
| Michaelis Engineering Limited | Professional & scientific | 1992 |
| Midland General Omnibus Company Limited(The) | Transport & logistics | 1986 |
| Midland Railway Enterprises PLC | Wholesale & retail | 1988 |
| Midland Structural Services Limited | Construction | 2007 |
| Midland Tree Management Limited | Agriculture & fishing | 2004 |
| Midlands Secretarial Services Limited | Professional & scientific | 1996 |
| Mighty MIX Limited | Manufacturing | 2007 |
| Mike Edwards & SON (Builders) Limited | Construction | 2003 |
| Miller Wates (Farnham) LLP | | 2025 |
| Milltek Sport Limited | Manufacturing | 1983 |
| Milner OFF Road Limited | Wholesale & retail | 2002 |
| Mining Explosives Limited | Manufacturing | 2006 |
| Mitchells People Solutions Limited | Professional & scientific | 2006 |
| Mithraco Limited | Construction | 2003 |
| MLM Assets Ltd | Hospitality | 2024 |
| Moa’S Kitchen Ltd | Hospitality | 2026 |
| Mobile & Separation Equipment Limited | Manufacturing | 2001 |
| Montgomery Construction Limited | Professional & scientific | 2023 |
| Moore to LET Limited | Real estate | 2004 |
| Moorfield Industries Limited | Manufacturing | 1990 |
| Moorleys Print & Publishing Ltd | Manufacturing | 1971 |
| Morleys Derby Limited | Wholesale & retail | 1973 |
| Morton Groundworks Limited | Wholesale & retail | 2002 |
| Motor Plus Derby Limited | Wholesale & retail | 1997 |
| Motorcycle Services Limited | Wholesale & retail | 2003 |
| MPS Accountancy Services Limited | Professional & scientific | 2003 |
| MR B'S Garden Services Limited | Administrative & support | 2003 |
| MR Chips | | 1995 |
| MSE Systems Limited | Manufacturing | 2007 |
| MV Property Limited | Real estate | 1996 |
| Myla Property Development Ltd | Construction | 2019 |
| Mysure Limited | Financial services | 2004 |
| N K Motors Limited | Wholesale & retail | 2000 |
| N. & R.Needham Company Limited | Professional & scientific | 1972 |
| N.B.E. Fire & Security Limited | Administrative & support | 2001 |
| N2N Properties Ltd | Real estate | 2023 |
| Natural Choice Health Limited | Wholesale & retail | 2005 |
| Navigation Garage (Heanor) Limited | Construction | 1984 |
| Neater Solutions Limited | Manufacturing | 1998 |
| Nedtown Limited | Financial services | 2003 |
| Needham Dairy Limited | Wholesale & retail | 2003 |
| Neil Darlington Limited | Construction | 2003 |
| Neil North & Associates Limited | Construction | 2004 |
| NET Factory Limited | Information & communication | 2003 |
| Net-Recruit.Co.Uk Limited | Administrative & support | 2005 |
| Netmatrix Consulting Limited | Information & communication | 1999 |
| Nets-Build Limited | Extraterritorial | 2005 |
| New Image Car Care Limited | Wholesale & retail | 2017 |
| New Image Holdings Limited | Financial services | 2018 |
| New Image Smart Repair Limited | Wholesale & retail | 2016 |
| New Image Valeting Limited | Wholesale & retail | 1997 |
| New Lane Motors Limited | Wholesale & retail | 2001 |
| New Leaf Catering Partnership Limited | Hospitality | 2000 |
| New Park Court Management Co Limited | Households | 2003 |
| New Park Place Limited | Health & social care | 2021 |
| Newbridge Developments Limited | Construction | 2008 |
| Newport Vale Management Company Ltd | Households | 2025 |
| Nick Smith Associates Limited | Professional & scientific | 2004 |
| Nixon Industrial Ltd | Wholesale & retail | 2000 |
| NJC (Sales) Limited | Administrative & support | 2003 |
| NJJ Consult Ltd | Health & social care | 2021 |
| NO44 Bistro Ltd | Hospitality | 2024 |
| Noisy Soup Limited | Public administration | 2006 |
| North East Progressive Mobility Limited | Health & social care | 1999 |
| Northern Glass Works (Inc. Building Maintenance) Limited | Wholesale & retail | 1996 |
| Northern Tea Merchants Ltd | Manufacturing | 2007 |
| Northgate (Ebbw Vale) Management Company Limited | Households | 2022 |
| Nottingham Philharmonic Orchestra Limited | Arts & recreation | 1989 |
| Nottinghamshire and Derbyshire Traction Company Limited | Transport & logistics | 1986 |
| NT Mccarron Ltd | Financial services | 2024 |
| Oaks Community Church, North East Derbyshire | Other services | 2004 |
| Object Solutions Limited | Information & communication | 2003 |
| Odedra Trading Limited | Wholesale & retail | 2005 |
| Officetek Limited | Information & communication | 2002 |
| Oh&A Ltd | Wholesale & retail | 2024 |
| Oldknow Associates Limited | Extraterritorial | 2005 |
| Ongears Limited | Professional & scientific | 2000 |
| Online Centre Ltd | Administrative & support | 2005 |
| Optimum Product Design and Marketing Limited | Professional & scientific | 2005 |
| Orchard Garden Private Day Nursery Limited | Education | 2003 |